This is what I found in the garage attic. I had planned on posting more pics but the site only allows one at a time?. I have spent over an hr trying to post more than one but it won't allow it. It's a Hartzell , 9' long, and looks to have never been used. Says Wright Aaviation on the hub

It's strange to see no decals on it, and early Hartzell propellers were made with walnut, not oak.

After doing some research this may be an early experimental prop.
It also appears this maybe made for a dirigible, how cool is that! I have some more digging around to do on this, hopefully finding out if it was made for a plane or a Hindenburg.
I know it hasn't seen the light of day since the 1950's, I found it still wrapped up in brown paper, it looks to have never been installed